03 dodge 2500 diesel, compustar

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tedmond

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Joined: January 06, 2007

Location: Ontario, Canada

Posted: December 19, 2007 at 2:56 PM / IP Logged

1) so I need to find the tach wire in the engine bay.

--Gray/black (AC) @ the passenger side of firewall under the hood.

2)Also my high beams are flashing with my parking lights. I have a negitive trigger with 330 ohm resistor on it going to the purple / YELLOW wire behind the parking light switch. help

-- parking lights is purple / YELLOW (-) with a 1.4k ohm resistor. To flash headlights, it uses the same wire, but through a 1.8k ohm resistor. to prevent feedback on the parking ligh wire, diode or relay block them (isolate).

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 3:20 PM / IP Logged

got it thank you, now I need to find the diesel tach wire. Any help there?

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 3:21 PM / IP Logged

how woul I relay block them?

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 3:24 PM / IP Logged

passanger side of my firewall there is a black plug which looks like just n interconnect and there is no gray/black. its a 5.9 cummings

vitrox

Copper - Posts: 96

Joined: June 10, 2003

Posted: December 19, 2007 at 4:02 PM / IP Logged

i got gray/black in black plug on right side of firewall for 03 2500.

for 02 it lists gray/black In the top black plug in the center of the firewall in the engine compartment.

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 4:26 PM / IP Logged

ok this is getting really frustrating. I have 1.4k resistor on the lights, and the headlights are still flashing with the parking lights. And I cannot find the tach wire for the life of me. I do not have a plug of the passanger side with a grey/black in it, and I found a grey black on the plug closest to the firewall, on the dirvers side of the engine, but it is not a tach wire. I am going to go crazy

vitrox

Copper - Posts: 96

Joined: June 10, 2003

Posted: December 19, 2007 at 4:29 PM / IP Logged

parking lights are WHITE/ gray or BLACK / YELLOW (+) in harness running along top of firewall on drivers side, there are multiple wires in there same color so test carefully.

i don't remember what year they went from BLACK / YELLOW to WHITE/ gray so check for both.

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 4:36 PM / IP Logged

parking lights are fixed,i figured out the relay blocking. still needing to find tach wire

vitrox

Copper - Posts: 96

Joined: June 10, 2003

Posted: December 19, 2007 at 4:54 PM / IP Logged

every program i've checked says gray/black in black plug at pcm. sometimes the compustars have a hard time pickup up a weak tach signal. its one of the problems we're trying to get them to fix.

you may have to use voltage sensing or try using the alternator signal.

brakisshuro

Member - Posts: 33

Joined: December 09, 2007

Location: Idaho, United States

Posted: December 19, 2007 at 5:02 PM / IP Logged

ok I am going to set it up to be alternator sensing, but it seems like I didn't get the parking lights. now the headlights are flashing with turn signals. I need some one to write out he relay for relay blocking since it has a rest resistance on it Thank you all.

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03 dodge 2500 diesel, compustar

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